#include <stdio.h>
// #include "freertos/FreeRTOS.h"
// #include "freertos/task.h"

// void app_main() {
//   printf("Hello, Wokwi!\n");
//   while (true) {
//     vTaskDelay(1000 / portTICK_PERIOD_MS);
//   }
// }


/*
 * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Unlicense OR CC0-1.0
 */
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/rmt_tx.h"
#include "led_strip_encoder.h"

#define RMT_LED_STRIP_RESOLUTION_HZ 10000000 // 10MHz resolution, 1 tick = 0.1us (led strip needs a high resolution)
#define RMT_LED_STRIP_GPIO_NUM 15

#define EXAMPLE_LED_NUMBERS 1
#define EXAMPLE_CHASE_SPEED_MS 10

static const char *TAG = "example";

static uint8_t led_strip_pixels[EXAMPLE_LED_NUMBERS * 3];

/**
 * @brief Simple helper function, converting HSV color space to RGB color space
 *
 * Wiki: https://en.wikipedia.org/wiki/HSL_and_HSV
 *
 */
void led_strip_hsv2rgb(uint32_t h, uint32_t s, uint32_t v, uint32_t *r, uint32_t *g, uint32_t *b)
{
  h %= 360; // h -> [0,360]
  uint32_t rgb_max = v * 2.55f;
  uint32_t rgb_min = rgb_max * (100 - s) / 100.0f;

  uint32_t i = h / 60;
  uint32_t diff = h % 60;

  // RGB adjustment amount by hue
  uint32_t rgb_adj = (rgb_max - rgb_min) * diff / 60;

  switch (i)
  {
  case 0:
    *r = rgb_max;
    *g = rgb_min + rgb_adj;
    *b = rgb_min;
    break;
  case 1:
    *r = rgb_max - rgb_adj;
    *g = rgb_max;
    *b = rgb_min;
    break;
  case 2:
    *r = rgb_min;
    *g = rgb_max;
    *b = rgb_min + rgb_adj;
    break;
  case 3:
    *r = rgb_min;
    *g = rgb_max - rgb_adj;
    *b = rgb_max;
    break;
  case 4:
    *r = rgb_min + rgb_adj;
    *g = rgb_min;
    *b = rgb_max;
    break;
  default:
    *r = rgb_max;
    *g = rgb_min;
    *b = rgb_max - rgb_adj;
    break;
  }
}

void app_main(void)
{
  uint32_t red = 0;
  uint32_t green = 255;
  uint32_t blue = 0;
  // uint16_t hue = 0;
  // uint16_t start_rgb = 0;

  led_strip_pixels[0] = green;
  led_strip_pixels[1] = blue;
  led_strip_pixels[2] = red;

  // for (uint8_t i = 1; i < 24; i++)
  // {
    ESP_LOGI(TAG, "Create RMT TX channel");
    rmt_channel_handle_t led_chan = NULL;
    rmt_tx_channel_config_t tx_chan_config = {
        .clk_src = RMT_CLK_SRC_DEFAULT, // select source clock
        .gpio_num = RMT_LED_STRIP_GPIO_NUM,
        .mem_block_symbols = 64, // increase the block size can make the LED less flickering
        .resolution_hz = RMT_LED_STRIP_RESOLUTION_HZ,
        .trans_queue_depth = 4, // set the number of transactions that can be pending in the background
    };
    ESP_ERROR_CHECK(rmt_new_tx_channel(&tx_chan_config, &led_chan));

    ESP_LOGI(TAG, "Install led strip encoder");
    rmt_encoder_handle_t led_encoder = NULL;
    led_strip_encoder_config_t encoder_config = {
        .resolution = RMT_LED_STRIP_RESOLUTION_HZ,
    };
    ESP_ERROR_CHECK(rmt_new_led_strip_encoder(&encoder_config, &led_encoder));

    ESP_LOGI(TAG, "Enable RMT TX channel");
    ESP_ERROR_CHECK(rmt_enable(led_chan));

    ESP_LOGI(TAG, "Start LED rainbow chase");
    rmt_transmit_config_t tx_config = {
        .loop_count = 0, // no transfer loop
    };

    // Flush RGB values to LEDs
    ESP_ERROR_CHECK(rmt_transmit(led_chan, led_encoder, led_strip_pixels, sizeof(led_strip_pixels), &tx_config));
    ESP_ERROR_CHECK(rmt_tx_wait_all_done(led_chan, portMAX_DELAY));
    vTaskDelay(pdMS_TO_TICKS(2000));
  // }

  // while (1) {
  //     for (int i = 0; i < 3; i++) {
  //         for (int j = i; j < EXAMPLE_LED_NUMBERS; j += 3) {
  //             // Build RGB pixels
  //             hue = j * 360 / EXAMPLE_LED_NUMBERS + start_rgb;
  //             led_strip_hsv2rgb(hue, 100, 100, &red, &green, &blue);
  //             led_strip_pixels[j * 3 + 0] = green;
  //             led_strip_pixels[j * 3 + 1] = blue;
  //             led_strip_pixels[j * 3 + 2] = red;
  //         }
  //         // Flush RGB values to LEDs
  //         ESP_ERROR_CHECK(rmt_transmit(led_chan, led_encoder, led_strip_pixels, sizeof(led_strip_pixels), &tx_config));
  //         ESP_ERROR_CHECK(rmt_tx_wait_all_done(led_chan, portMAX_DELAY));
  //         vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
  //         memset(led_strip_pixels, 0, sizeof(led_strip_pixels));
  //         ESP_ERROR_CHECK(rmt_transmit(led_chan, led_encoder, led_strip_pixels, sizeof(led_strip_pixels), &tx_config));
  //         ESP_ERROR_CHECK(rmt_tx_wait_all_done(led_chan, portMAX_DELAY));
  //         vTaskDelay(pdMS_TO_TICKS(EXAMPLE_CHASE_SPEED_MS));
  //     }
  //     start_rgb += 60;
  // }
}